Berkshire Hathaway cuts PetroChina stake to 7.99%
MarketWatch - 30 minutes ago
By Aries Poon , , ) to 7.99% from 8.21%, according to a filing by the US company to the Hong Kong stock exchange Friday. This is the fourth time the Omaha-based company has publicly disclosed a sale of PetroChina listed shares since July.

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It is very unusual for Warren Buffett to sell stock. I do not know of a prior instance when Mr. Buffett sold stock.

Warren Buffett didn't sell anything, berkshire did, read the article. There are numerous shareholders in berkshire that invest in stocks without Buffett's knowledge or blessing... especially when it comes to reinsurance float.